package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;

public class RefreshTokenInterceptor implements HandlerInterceptor {


    private StringRedisTemplate stringRedisTemplate;
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }
    /**
     * 登录校验
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //获取请求头中的token
        String token = request.getHeader("authorization");
        if(StrUtil.isBlank(token)){
            return true;
        }
       //获取基于token获取redis的用户
        String key=LOGIN_USER_KEY +token;
        Map<Object ,Object> userMap=stringRedisTemplate.opsForHash()
                .entries(key);
        //判断用户是否存在
        if(userMap.isEmpty()) {
         return true;
        }
    //将查询到hash数据转为UserDTO对象
        UserDTO userDTO= BeanUtil.fillBeanWithMap(userMap,new UserDTO(),false);
       //存在，保存用户信息到Threadlocal
        UserHolder.saveUser(userDTO);
        //刷新token有效期
        stringRedisTemplate.expire(key,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        //放行
        return true;
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }

}
